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ktgohan's profile
ktgohan (C95欠席)
ktgohan (C95欠席)
ktgohan (C95欠席)
@ktgohan

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ktgohan (C95欠席)

@ktgohan

量産型のインフラエンジニアといいつつ何でも屋。USB充電本サークル @origamidevices オリガミデバイセズ+技書話人伝主催。瑞雲改二勢。浦賀船渠ノ航跡関連→ http://ktgohan2.hatenablog.com/entry/2015/02/03/024037 …

相模原, 宇津帆島, 舞鎮, and 本栖高校部室棟
ktgohan.com/contact/
Joined November 2012

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    ktgohan (C95欠席)‏ @ktgohan Dec 29

    監視サービス等からのメールがどこかで握り潰されている問題、前々から起きてきて何なんだこれと悩んでいたのだけれどようやく原因わかった気がする。STARTTLSしたときの問題か、ひょっとして。

    5:00 AM - 29 Dec 2018
    • 16 Retweets
    • 17 Likes
    • ziplock Suza PPOI まーぶ@3日目月曜 東Q-49b さかむけさん Se AKi@Adsenseクリックして 不覚亭ヨウ素@IT落語家 とに MUROTA
    1 reply 16 retweets 17 likes
      1. New conversation
      2. ktgohan (C95欠席)‏ @ktgohan Dec 29

        AWSはSESから投げているので特には問題にはなっていないのだが、OP25Bしているクラウドサービスやホスティングサービスの場合、NW内のどこかに一度集約してそこからどこかにリレーする、という形をおれはよくとる。問題はその先のMTAサーバーだった。

        1 reply 10 retweets 11 likes
        Show this thread
      3. ktgohan (C95欠席)‏ @ktgohan Dec 29

        ・リレー元のMTAの環境が古く、TLS 1.2 が使えない(STARTTLS 以後、TLS 1.1 以前しか使えない) ・リレー先のMTAの環境が、TLS 1.1 以前をいつの間にかdisableしている 監視系のメールは社外に587/tcpで投げていて恒常的に使っているものではないため、今日まで気づかなかった。やべえ。これ不味い。

        1 reply 24 retweets 32 likes
        Show this thread
      4. ktgohan (C95欠席)‏ @ktgohan Dec 29

        Webサーバーで『TLS 1.1 以前をdisableにします』なんてのはほんとによく聞く話だけれど、メールサーバーの STARTTLS もこの影響及ぶことに今の今まで気づかなかった。なんてことだ。クソヤバすぎる。穴掘って埋まりたい…

        1 reply 23 retweets 28 likes
        Show this thread
      5. ktgohan (C95欠席)‏ @ktgohan Dec 29

        ktgohan. com のメールサーバも見事にこれに引っかかっていた可能性が出てきた。うげー… うちの受信側はたぶん大丈夫なんだが、うちの送信側がひょっとしたらという…

        0 replies 3 retweets 3 likes
        Show this thread
      6. End of conversation

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